Restore failing on our projects #35057

      Restore and Build Product (00:02:06.8766666) (CmdLine) Failed
        error Code: .dotnet\sdk\5.0.100-preview.4.20202.8\NuGet.RestoreEx.targets(10,5): error : (NETCORE_ENGINEERING_TELEMETRY=Restore) The project file could not be loaded. Could not find a part of the path 'F:\workspace\_work\1\s\src\libraries\Common\tests\CoreFx.Private.TestUtilities.Unicode\CoreFx.Private.TestUtilities.Unicode.csproj'.  F:\workspace\_work\1\s\src\libraries\Common\tests\CoreFx.Private.TestUtilities.Unicode\CoreFx.Private.TestUtilities.Unicode.csproj
   at Microsoft.Build.Shared.ProjectFileErrorUtilities.VerifyThrowInvalidProjectFile(Boolean condition, String errorSubCategoryResourceName, BuildEventFileInfo projectFile, Exception innerException, String resourceName, Object[] args)
   at Microsoft.Build.Shared.ProjectFileErrorUtilities.ThrowInvalidProjectFile(BuildEventFileInfo projectFile, Exception innerException, String resourceName, Object[] args)
   at Microsoft.Build.Construction.ProjectRootElement.LoadDocument(String fullPath, Boolean preserveFormatting, Boolean loadAsReadOnly)
   at Microsoft.Build.Construction.ProjectRootElement..ctor(String path, ProjectRootElementCacheBase projectRootElementCache, Boolean preserveFormatting)
   at Microsoft.Build.Construction.ProjectRootElement.CreateProjectFromPath(String projectFile, ProjectRootElementCacheBase projectRootElementCache, Boolean preserveFormatting)
   at Microsoft.Build.Evaluation.ProjectRootElementCache.Get(String projectFile, OpenProjectRootElement openProjectRootElement, Boolean isExplicitlyLoaded, Nullable`1 preserveFormatting)
   at Microsoft.Build.Construction.ProjectRootElement.OpenProjectOrSolution(String fullPath, IDictionary`2 globalProperties, String toolsVersion, ProjectRootElementCacheBase projectRootElementCache, Boolean isExplicitlyLoaded)
   at Microsoft.Build.Evaluation.Project.ProjectImpl..ctor(Project owner, String projectFile, IDictionary`2 globalProperties, String toolsVersion, String subToolsetVersion, ProjectLoadSettings loadSettings, EvaluationContext evaluationContext)
   at Microsoft.Build.Evaluation.Project..ctor(String projectFile, IDictionary`2 globalProperties, String toolsVersion, String subToolsetVersion, ProjectCollection projectCollection, ProjectLoadSettings loadSettings, EvaluationContext evaluationContext)
   at Microsoft.Build.Evaluation.Project.FromFile(String file, ProjectOptions options)
   at NuGet.Build.Tasks.Console.MSBuildStaticGraphRestore.<>c__DisplayClass37_1.<LoadProjects>b__0(String path, Dictionary`2 properties, ProjectCollection collection)
   at Microsoft.Build.Graph.GraphBuilder.ParseProject(ConfigurationMetadata configurationMetadata)
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at Microsoft.Build.Graph.ParallelWorkSet`2.ExecuteWorkItem()
   at Microsoft.Build.Graph.ParallelWorkSet`2.<CreateProcessorItemTask>b__16_0()
   at Microsoft.Build.Graph.ParallelWorkSet`2.WaitForAllWorkAndComplete()
   at Microsoft.Build.Graph.GraphBuilder.FindGraphNodes()
   at Microsoft.Build.Graph.GraphBuilder.BuildGraph()
   at Microsoft.Build.Graph.ProjectGraph..ctor(IEnumerable`1 entryPoints, ProjectCollection projectCollection, ProjectInstanceFactoryFunc projectInstanceFactory, Int32 degreeOfParallelism, CancellationToken cancellationToken)
   at Microsoft.Build.Graph.ProjectGraph..ctor(IEnumerable`1 entryPoints, ProjectCollection projectCollection, ProjectInstanceFactoryFunc projectInstanceFactory)
   at NuGet.Build.Tasks.Console.MSBuildStaticGraphRestore.LoadProjects(IEnumerable`1 entryProjects)